This is known to cause issues (forum topic here for example).
Please contactsupport with as subject “A10 - SD card phone storage issue”. They can’t reproduce the issue with the internal storage formatted card, so the more data they will have, the sooner it’ll get solved.
Before FP solve the issue, you should indeed format it as external storage for the card the card to work correctly. In any case, even if it worked, I advise against formatting as internal storage. If either the phone or the card break, you lose all the data and the other device is broken (and a faulty SD card is quite common). See the sdcardguide for more details about SD-cards.
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